Washington: In-migration Compare to others State rankings for U.S. County rankings for Idaho Download data Download state data for the US Download county data for Idaho Download multiple indicators/regions In Washington between 2017 and 2018, the number of tax returns filed by individuals or households moving into Washington was 284. Of these: 52.8 percent were filed by people or households moving from another county in Idaho State 47.2 percent were filed by people or households moving from another state 0.0 percent were filed by people or households moving from another country         Data represents all returns filed/processed through the Individual Master File System. NA: data have been suppressed for reasons of disclosure. Source: 2020 Internal Revenue Service (IRS) - (https://www.irs.gov/statistics/soi-tax-stats-migration-data); DATE LAST UPDATED: October 20, 2020